I tow with a Mercedes ML320- It's a big 6 banger. When in the mountains, I watch my temperature gauge pretty closely. I don't push it and keep my flashers on as soon as I drop below 50 or so. Usually I'm right in there with really loaded semis. So far I haven't had any issues but I don't break any land speed barriers either. Fortunately, most of these types of grades are pretty short.
Phil
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